全水基杂化型无氟防水剂制备及其在涤/棉织物防水整理中应用

针对当前有机-无机杂化型无氟织物防水剂含的有机溶剂存在环境不友好的问题,创新性地将长碳链硅烷改性硅溶胶(H-NPs)乳液与聚硅氧烷改性水性聚氨酯(SiWPU)相结合,制备出一种全水基的杂化型无氟织物防水剂。重点研究了全水基杂化无氟防水剂中有机/无机组分比例及其用于涤/棉织物整理时焙烘温度和时间等因素的影响,通过扫描电子显微镜观察了涤/棉织物整理前后纤维表面的形貌变化,并考察了其在涤/棉织物防水整理中的应用性能。结果表明:疏水整理织物的水接触角随着H-NPs质量分数的增加而逐渐增大,并在H-NPs质量分数为27.5%时达到最大值(138 ± 2.0)°;在相同焙烘时间下,180 ℃焙烘的疏水整理织物相比150 ℃焙烘时具有更大的水接触角;同时,整理织物的水接触角随着焙烘时间增加逐渐增大,并在焙烘5 min时具有最大的水接触角;疏水整理织物的纤维表面可明显观察到微纳米尺度的凸起结构,验证了其微纳粗糙结构的存在。

Preparation and application of fully aqueous organic-inorganic hybrid fluorine-free water-repellant finishing agents

In view of the problem that organic-inorganic hybrid fluorine-free water-repellant finishing agents are not environmental friendly due to organic solvent,the long-chain alkyl silane modified sol(H-NPs)emulsion and polysiloxane modified waterborne polyurethane(SiWPU)emulsion were combined to prepare fully aqueous organic-inorganic hybrid fluorine-free water-repellant finishing agents.The effects of organic/inorganic component ratio in organic-inorganic hybrid fluorine-free water-repellant finishing agents were studied,and the influences of baking time and temperature on the property of finished polyester/cotton fabric were also discussed in detail.Micro-nano rough structures on the surface of finished polyester/cotton fabric were observed by SEM,and its application performance was also investigated.The results reveal that the water contact angle on the surface of the finished fabric gradually increases with the increase of H-NPs mass fraction,reaching the maximum value of(138±2.0)°when H-NPs mass fraction is 27.5%.For the same baking time,the finished fabric baked at 180℃demonstrates a higher water contact angles compared with that baked at 150℃.Additionaly,the water contact angle of the finished fabric increases gradually with baking time,with the optimal baking time determined to be 5 min.The convex structure of micro/nano scale is also observed on the surface of finished fabric,significantly verifing the existence of micro/nano rough structure.